schaake



March 8, 1932. w. SCHAAKE PANTOGRAPH COLLECTOR Filed Oct. 20, 1930 2sheets-sh et l NVENTOR Wz/Zz'am Sc/make.

ATLFORNEY w. SCHAAKE PANTOGRAPH COLLECTOR Filed Oct. 20, 1930 2Sheets-Sheet 2 INVENTOR William Sch flake.

' ATTORNEY cam 23 on the shaft 12 may be changed by means of two setscrews 24. It will be ob served that a collar 25, which is keyed to theshaft 12 by two pins 26, is provided with a downwardly extending arm 27and also an upwardly extending arm 28. The cam 23 is rotatably mountedon the shaft 12 and is retained on the shaft by a ring 29 which is keyedto the shaft 12 by a pin 31. The cam 23 is provided with a downwardlyextending arm 32 which is disposed between two outwardly projecting lugs33 on the arm 27 of the collar 25. The set screws 24 are mounted in thelugs 33 to engage the arm 32 of the cam 23. In this manner, the positionof the cam 23 on the shaft 12 may be changed by adjusting the set screws24:.

As shown in Fig. 2, equalizing rods 34 are provided to ensure that thetwo shafts 12 shall be rotated to the same degree. One end of the rod34is connected to the arm 28 of the collar 25, and the other end isconnected to thelever arm 19 which is actuated by the air cylinder 18.One equalizing rod is provided at each sideof the pantograph frame.

It will be seen that the force exerted by the auxiliary springs 21,tending to raise the pantograph frame and also the pressure of thecollecting shoes 14 against the overhead conductor, may be governed bychanging the position of the cams 23 on the shafts 12 by means of theset screws 24. Changing the position of the cams 23 Varies the tensionof the springs 21 and also varies the moment of the torque applied bythe springs to rotate the shafts 12.

the above-described construction, and dif-- f erent embodiments of theinvention may be made without departing from the scopet l 1 ereof, it isdesired that all matter contained in the foregoing description or shownin the accompanying drawings shall be interpreted as illustrative andnot in a limiting sense.

I claim as my invention:

I 1. In a pantograph collector, in combination, a supporting frame, aplurality of rotatable shafts carried by said frame, a pantograph framemounted upon said shafts, a collecting shoe carried by the pantographframe, means biased by springs for raising the pantograph frame, meansactuated by fluid pressure to lower the pantograph frame, andadjustable-cam means for varying the force exerted by the spring-biasedmeans for raising the pantograph frame.

2. In a pantograph trolley for collecting current from a trolleyconductor, in combina: tion, a pantograph frame, a plurality of shaftsfor supporting said frame and for actuating the same when rotated, aplurality of cams mounted upon and rotating with said shafts, aplurality of springs connected to the cams and disposed to rotate theshafts to actuate the pantograph frame in one direction, means actuatedby fluid pressure to 1'0- tate the shafts to actuate the pantographframe in the opposite direction, and means for adjusting the position ofthe cams on the shafts forvarying the tension of said springs to varythe force exerted on the pantograph frame.

3. In a pantograph trolley for collecting current from a trolleyconductor, in combina tion,. a pantograph frame, a plurality of shaftsfor supporting saidframe and for actuating the same when rotated, aplurality of cams mounted upon and rotating with said shafts, aplurality of springs connected to the cams and disposedto rotate theshafts to raise the pantograph frame, means actuated by fluid pressureto rotate the shafts to lower the pantograph frame, and means forvarying the position of the cams on the shafts to vary the force appliedby the springs.

4. In a pantograph trolley for collecting current from a trolleyconductor, in combination, a pantograph frame, a collecting shoe carriedby the frame and disposed to make contact with the trolley conductor, aplurality of shafts for supporting said frame and for actuating the samewhen rotated, a plurality of cams mounted upon and rotating with saidshafts, a plurality of springs connected to the cams and disposed torotate the shafts to raise the collecting shoe into engagement with thetrolley conductor, a plurality of mechanisms actuated by fluid pressureto rotate the shafts to lower the collecting shoe, and means foradjusting the position of certain of said cams on the shafts to changethe tension of certain of said springs, thereby varying the :rent from atrolley conductor comprising a supporting frame, a pantograph frame,

pressure between the collecting shoe and the spring means for raisingthe frame, fluid,

pressure means for lowering the frame, and means for varying the forceexerted by the spring means, whereby the pantograph frame may beutilized for supporting one or a plurality of current-collecting shoes.

6. A pantograph trolley for collecting current from a trolley conductorcomprising a supporting frame, a pantograph frame, a plurality ofrotatable shafts for supporting the pantograph frame, a plurality ofcams mounted upon and rotating with said shafts,

a plurality of springs connected to the cams and disposed to raise thepantograph frame, mechanisms; actuated by fluid-pressure to 7 lower thepantograph frame, and means for 7 changing the position of certain ofsaid cams on the shaft to vary the force exerted by certain of saidsprings, whereby the pantograph frame may be utilized to support one ora plurality of collecting shoes. 7 v 7. In a pantograph trolley forcollecting 10 current from a trolley conductor, in combination,apantograph frame, a plurality of rotatable shafts for supporting thepanto graph frame, aplurality of cams mounted upon androtating with theshafts, a plurality of springs connected to the cams and dis posed toapply a torque to rotate the shafts, and means'for adjusting theposition of the cams on the shafts to Vary the torque applied by thesprings. 77

In testimony whereof, I have hereunto subscribed my name this th day ofOctober,

1930. V s I WILLIAM SGHAAKE.

